Body composition and metabolic profiles associated with puberty in beef heifers1

Hall, J. B.; Staigmiller, R. B.; Bellows, R. A.; Short, R. E.; Moseley, W.M.; Bellows, Susan E.

doi:10.2527/1995.73113409x

Cited by 85 publications

(56 citation statements)

References 52 publications

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“…However, heifers on treatment High probably accumulated more adipose tissue, as evidenced by the greater BCS, indicating that energy intake altered body composition of heifers at puberty. Previous studies with different breeds also demonstrated that greater energy intake during the prepubertal period results in greater fat deposition in the carcass (McShane et al, 1989;Hall et al, 1995). In contrast to our results, most studies report an increase in BW at puberty in heifers offered greater energy diets (Baker et al, 1989;Hopper et al, 1993;Hall et al, 1995).…”

Section: Discussioncontrasting

confidence: 56%

Effect of chronic infusion of leptin and nutrition on sexual maturation of zebu heifers1

Carvalho

Diniz-Magalhães

Pereira

et al. 2013

Journal of Animal Science

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ABSTRACT:The amount of fat in the carcass has been proposed as a regulator of initiation of puberty in cattle. To test if changes in energy intake and in circulating leptin concentration are each capable of altering age, BW, and body composition at puberty, 36 prepubertal Nellore heifers, 18 to 20 mo old, 275.8 ± 17.2kg BW, and BCS of 5 ± 0.5 (1 to 9 scale), were randomly assigned to each of 3 treatments (n = 12): High (high energy diet), Low (low energy diet), and LL [low energy diet + ovine leptin (oLeptin)]. Diets were formulated to promote BW gain of 0.4 kg/d (groups Low and LL) or 1.2 kg/d (High group). After 14 d of adjustment to diet, heifers in LL group received subcutaneous injections of oLeptin at 4.8 μg/kg BW twice a day for 56 d. Groups High and Low received similar injections of 2 mL saline solution. Age at puberty was considered to be the age on fi rst detection of a corpus luteum, confi rmed by plasma concentrations of progesterone of >1 ng/mL. Heifers were slaughtered on the second day after fi rst corpus luteum detection. Expression of leptin gene was quantifi ed by real-time PCR using ribosomal protein-L19 (RP-L19) as a control gene. Leptin administration increased

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Section: Discussioncontrasting

confidence: 56%

Effect of chronic infusion of leptin and nutrition on sexual maturation of zebu heifers1

Carvalho

Diniz-Magalhães

Pereira

et al. 2013

Journal of Animal Science

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“…We observed that animals were supplemented within a period of at least 120 days of each experimental protocol and reached BCS at a specific period of supplementation to achieve puberty earlier in life. Hall et al (1995) verified a BCS of 7.0 (scale from 1 to 9) at puberty in heifers with an increase rate of 1.0 kg day −1 . In the present study, we observed a correlation of -0.37 between the BCS and age of puberty indicating that the characteristics related to fat deposition influence puberty appearance.…”

Section: Discussionmentioning

confidence: 97%

“…The high correlation between longissimus muscle area and energy level after weaning is detected in Angus heifers (Hall et al, 1995). An important correlation between visual scores, live weights, and carcass traits obtained by ultrasound was found, which can be analyzed by univariate procedure (Pinto et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

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Relationship of post-weaning growth and age at puberty in crossbred beef heifers

et al. 2017

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-This study was intended to evaluate body size structure and growth parameters of crossbred heifers fed at four nutritional levels to achieve puberty earlier. Animals were classified depending on their level of crossing between Nelore and Hereford and subjected to four nutritional levels (kg day -1 ) as follows: 0.5 (light; n = 32), 0.75 (medium; n = 32), 1.00 (high; n = 29), and 1.25 (very high; n = 27). Heifers at puberty and at weaning were individually classified for growth parameters. The fat thickness and longissimus muscle area throughout the experimental period were determined by ultrasonography. The height, heart girth, frame, and weight:height ratio were variables used to evaluate body traits. Univariate analysis of variance using the GLIM MIXED procedure os SPSS was performed and the significance level was set at 0.05. Age and body weight at puberty were 388±1.9 days and 331.4±1.3 kg, respectively. Body condition score demonstrated an interaction between nutritional level and crossbred degree. Heifers with the highest degree of Nelore had higher fat thickness and lower weight:height ratio compared with other racial groups at puberty. Pearson correlation coefficient showed a negative association for body condition score (-0.34) and fat thickness (-0.58) compared with age at puberty. The increased fat thickness at younger ages at puberty was observed in all racial groups. The increased weight:height ratio at younger ages at puberty was observed in all racial groups. We observed higher values for a frame in animals at the higher level of supplementation. There is a greater correlation between live weight gain and phenotypic traits during weaning to achieve puberty at an earlier age in crossbred heifers.

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“…Shiotsuki et al (2009) obtained a genetic correlation of 0.18 between HP at 18 months of age and carcass finishing score. In a study on puberty in beef heifers, Hall et al (1995) verified that rapid growth large frame heifers were younger at puberty and had greater body condition score. Therefore, body composition and growth rate are related to reproductive activity of the female (Martin et al, 1992;Hall et al, 1995).…”

Section: Genetic Correlationsmentioning

confidence: 99%

Genetic relationship between growth and reproductive traits in Nellore cattle

Júnior

Eler

Ferraz

et al. 2012

Animal

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The objective of this study was to evaluate the genetic relationship between postweaning weight gain (PWG), heifer pregnancy (HP), scrotal circumference (SC) at 18 months of age, stayability at 6 years of age (STAY) and finishing visual score at 18 months of age (PREC), and to determine the potential of these traits as selection criteria for the genetic improvement of growth and reproduction in Nellore cattle. The HP was defined as the observation that a heifer conceived and remained pregnant, which was assessed by rectal palpation at 60 days. The STAY was defined as whether or not a cow calved every year up to the age of 6 years, given that she was provided the opportunity to breed. The Bayesian linear-threshold analysis via the Gibbs sampler was used to estimate the variance and covariance components applying a multitrait model. Posterior mean estimates of direct heritability were 0.15 6 0.00, 0.42 6 0.02, 0.49 6 0.01, 0.11 6 0.01 and 0.19 6 0.00 for PWG, HP, SC, STAY and PREC, respectively. The genetic correlations between traits ranged from 0.17 to 0.62. The traits studied generally have potential for use as selection criteria in genetic breeding programs. The genetic correlations between all traits show that selection for one of these traits does not imply the loss of the others.

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Body composition and metabolic profiles associated with puberty in beef heifers1

Cited by 85 publications

References 52 publications

Effect of chronic infusion of leptin and nutrition on sexual maturation of zebu heifers1

Effect of chronic infusion of leptin and nutrition on sexual maturation of zebu heifers1

Relationship of post-weaning growth and age at puberty in crossbred beef heifers

Genetic relationship between growth and reproductive traits in Nellore cattle

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